Base seat of pneumatic grinder

ABSTRACT

Base seat of pneumatic grinder, including an air way and a water way disposed in the base seat to respectively communicate with an air chamber and a water chamber formed in the base seat. Several water outlets and a predetermined number of air rooms are disposed on bottom face of the base seat. The water outlets communicate with the water chamber, while the air rooms communicate with the air chamber. Multiple ball bodies are respectively rollably disposed in the air rooms, the bottom edge of the ball bodies protrude from the bottom face of the base seat. When high pressure air and water are conducted into the air way and water way, the air is conducted by the air way to flow into the air chamber and to blow to the ball bodies in the air rooms making the ball bodies rolling easily. The water flows through the water way into the water chamber and then flows through the water outlets out of the bottom face of the base seat to reduce frictional force against the bottom face of the base seat.

BACKGROUND OF THE INVENTION

[0001] The present invention is related to a pneumatic tool, and moreparticularly to a base seat of pneumatic tool, which makes it easy tomove the pneumatic tool in operation.

[0002] Stone material is conventionally ground with an electric grinder.When grinding the stone material, it is necessary to move the grinder onthe stone material. The electric grinder has a considerably large volumeand considerable heavyweight. Therefore, it is uneasy to operate anelectric grinder. Moreover, the base seat of the electric grinder makesit hard to slide the electric grinder. Therefore, it always consumesmuch strength to move the electric grinder on the stone material.

SUMMARY OF THE INVENTION

[0003] It is therefore a primary object of the present invention toprovide a base seat of a grinder, especially to a base seat of apneumatic grinder, which by means of air and water reduces frictionalforce between the base seat and the stone material. Accordingly, thegrinder can be easily operated and moved.

[0004] The present invention can be best understood through thefollowing description and accompanying drawings wherein:

BRIEF DESCRIPTION OF THE DRAWINGS

[0005]FIG. 1 is a perspective assembled view of a preferred embodimentof the present invention;

[0006]FIG. 2 is a bottom perspective view according to FIG. 1;

[0007]FIG. 3 is a sectional view taken along line 3-3 of FIG. 1;

[0008]FIG. 4 is a sectional view taken along line 4-4 of FIG. 1;

[0009]FIG. 5 is a sectional view taken along line 5-5 of FIG. 1;

[0010]FIG. 6 is a sectional view of the barrel of the controlling switchof the present invention;

[0011]FIG. 7 is a perspective view of the valve of the controllingswitch of the present invention;

[0012]FIG. 8 shows the use of the present invention in one state;

[0013]FIG. 9 shows the use of the present invention in another state;

[0014]FIG. 10 is a side view according to FIG. 9;

[0015]FIG. 11 is a perspective view of the support tray and slide railof the bracket mechanism of the present invention;

[0016]FIG. 12 is an end view according to FIG. 11;

[0017]FIG. 13 is a perspective view of the base tray of the bracketmechanism of the present invention;

[0018]FIG. 14 is a bottom view according to FIG. 13;

[0019]FIG. 15 is a longitudinal sectional view according to FIG. 13;

[0020]FIG. 16 shows a using state according to FIG. 9; and

[0021]FIG. 17 shows that the base seat of the present invention ismounted on the bracket mechanism.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] Please refer to FIG. 1. The base seat 10 of the pneumatic grinderof the present invention has an internal air way and an internal waterway respectively communicating with an air chamber and a water chamber.Referring to FIG. 2, the bottom face of the base seat 10 is formed withseveral water outlets 65, 66 and ball bodies 60.

[0023] An inlet A is formed on top face of the base seat 10. In thisembodiment, the inlet is for both air and water. In detail, referring toFIG. 3, the top face of the base seat 10 is recessed to form a hole 12.An inner tube 14 is coaxially disposed in the hole 12. The interior ofthe hole 12 and the interior of the inner tube 14 form two concentricflow ways 16, 18. The flow way 18 is a part of the air way B, while theflow way 16 is a part of the water way C. The bottom face of the baseseat 10 is inward recessed to form a cavity 20 in which a controllingswitch 50 is disposed. (This will be described hereafter.)

[0024] The air chamber 30 as shown in FIGS. 3 and 4 and the waterchamber 40 as shown in FIGS. 3 and 5 are both disposed in the base seat10. The air chamber 30 is positioned above the water chamber 40.

[0025] In addition to the flow way 18, the air way B further includes asmall hole 141 and a passage 22. The small hole 141 is formed at bottomend of the inner tube 14. The passage 22 has a horizontal section 221and an upright section 222 communicating with each other. Two ends ofthe passage 22 respectively communicate with the small hole 141 and theair chamber 30, whereby the air way B communicates with the air chamber.The horizontal section 221 passes through the cavity 20.

[0026] In addition to the flow way 16, the water way C further includesa tunnel 24 and a conducting hole 26. The tunnel 24 communicates withthe flow way 16 and the cavity 40. As shown in FIG. 5, the conductinghole 26 communicates with the water chamber 40 from one side of thecavity 20. The conducting hole 26 and the tunnel 24 are positioned atthe same height.

[0027] Said controlling switch 50 includes a barrel 51 and a valve 55.As shown in FIG. 6, the circumference of the barrel 51 is formed withtwo through holes 52, 53. The first through hole 52 includes two ports521, 522 on the circumference of the barrel, which are linearlyarranged. The second through hole 53 includes two ports 531, 532 on thecircumference of the barrel, which are angularly spaced by 90 degrees.The first through hole 52 communicates with the horizontal section 221of the passage 22, while the ports 531, 532 of the second through hole53 respectively communicate with the tunnel 24 and the conducting hole26. A perforation 54 is formed on the bottom face of the barrel. Thevalve 55 is up and down movably disposed in the barrel 51. As shown inFIG. 7, two flow conducting sections 56, 57 as annular grooves areformed on the circumference of the valve. The valve is pushed by aspring 58, whereby in normal state, the valve is located at bottom endof the barrel 51. When the valve is positioned at a lower dead end, thefirst conducting section 56 is aligned with the first through hole 52 tokeep the air way B free, while the second conducting section 57 isaligned with the second through hole 53 to keep the water way C free. Inaddition, the perforation 54 of the barrel is positioned on bottom faceof the base seat, whereby the bottom end of the valve 55 is exposed tothe bottom face of the base seat and is touchable as shown in FIG. 2.

[0028] Thirteen hollow cylinder bodies 27 are integrally formed in thewater chamber 40 inside the base seat 10. The cylinder bodies areindependently disposed in the water chamber without communicating withthe water chamber. Each cylinder body defines therein an air room 28.The top end of the air room 28 communicates with the air chamber 30,while the bottom end of the air room 28 passes through the cylinder bodyto the bottom face of the base seat.

[0029] Thirteen ball bodies 60 are respectively mounted in the air rooms28. The ball body is located in the air room by means of hollow locatingmember 62 and spacer ring 63 disposed in the air room. The bottom edgeof the ball body 60 protrudes from the bottom face of the base seat 10.

[0030] Referring to FIG. 5, a predetermined number of water drainingholes, such as two rows of water draining holes 65, 66 are disposed onthe bottom walls of front and rear sides of the water chamber 40. Thewater draining holes pass through the bottom walls to the bottom face ofthe base seat 10.

[0031] In use of the present invention, the base seat 10 is mountedunder the main body 72 of the pneumatic grinder 70, as shown in FIG. 8.Two concentric inner and outer tubes disposed on the bottom face of themain body are inserted in the inlet A for inputting high pressure airand water from the inlet into the base seat. The structure of the mainbody is described in another application. In operation, the base seat 10is placed on the top face of the stone material 75 for grinding thestone material. The ball bodies 60 roll on the stone material so as toeasily move the base seat.

[0032] Referring to FIG. 3, a leakproof ring 15 is disposed at each oftop ends of the hole 12 and the inner tube 14 at the inlet A so as tokeep the flow way independent.

[0033] After the high pressure air is conducted into the flow way 18 ofthe air way B, the air flows from the small hole 141 into the horizontalsection 221 of the passage 22. Then the air flows the first through hole52 of the barrel 51 of the controlling switch 50 and the first flowconducting section 56 of the valve body 55 into the upright section 222of the passage to fill into the air chamber 30. Thereafter, the highpressure air flows into the air rooms 28 to blow to the ball bodies 60.

[0034] After the high pressure air flows into the air rooms 28, the airflows from the orifices 631 of the spacer rings 63 to the ball bodies 60to speed the airflow. When the air blows to the ball bodies 60, the ballbodies are suspended in the air rooms 28 (locating members 62) so as toreduce the rolling friction of the ball bodies and facilitate movementof the base seat.

[0035] When the water is conducted into the flow way 16 of the water wayC, the water flows from the tunnel 24 into the port 531 of the secondthrough hole 53 of the barrel 51 and the second flow conducting section57 of the valve body 55 and through the port 532 of the second throughhole, as shown in FIG. 5, and the conducting hole 26 into the waterchamber 40. Then, the water flows from the water draining holes 65, 66out of the bottom face of the base seat 10. The water is distributedbetween the bottom face of the base seat and the stone material. Thisalso reduces the frictional resistance between the base seat and thestone material and makes it easy to move the base seat.

[0036] Referring to FIG. 9, the present invention further includes abracket mechanism 80 including:

[0037] a support tray 90 as shown in FIG. 11, four insertion posts 92being disposed on top face of the support tray 90, the insertion posts92 being inserted in four insertion holes 29 formed on two sides ofbottom face of the base seat 10 as shown in FIGS. 2 and 5, referring toFIG. 5, two lateral faces of the base seat being further formed with twodents 95 communicating with the edges of the two insertion holes 29 ofthe base seat, a slide block 96 being locked in each dent 95 by a screw97, the slide blocks 96 serving to engage with recessed sections 93 ofthe insertion posts 92 to prevent the insertion posts 92 from beingextracted out; an abutting post 94 being fixed on the top face of thesupport tray, referring to FIG. 17, the abutting post serving to extendthrough the perforation 54 of the bottom face of the base seat 10 toupward push the valve 55 of the controlling switch 50;

[0038] a slide rail 100, two parallel clamping blocks 91 being disposedon the bottom face of the support tray 90 to define an insertionchannel, the slide rail 100 being inserted in the insertion channel asshown in FIGS. 11 and 12, whereby the support tray 90 can slide alongthe slide rail;

[0039] a connecting block 105 fixed on the bottom face of the slide rail100 by two screws 106 as shown in FIG. 10, the bottom face of theconnecting block 105 being formed with a shaft hole (not shown) in whicha bearing is mounted; and

[0040] a base tray 110 as shown in FIGS. 13 to 15, a depression 112being formed on bottom face of the base tray 110, a gum ring 113 beingdisposed around the depression 112. On the base tray 110 are disposed:

[0041] a cylinder room 114 disposed on top face of the base tray andcovered by a cylinder cover 115, a piston 116 being disposed in thecylinder room 114;

[0042] a lever 118, one end of the lever being pivotally connected witha lug 119 of the base tray, a lever body of the lever being connectedwith a piston rod 117 of the piston 116;

[0043] two one-way valves 120, 122 disposed in the base tray, theone-way valve 120 being an air inlet one-way valve communicating withthe cylinder room 114 and the depression 112, whereby the air can onlyone-way flow from the depression to the cylinder room, the one-way valve122 being an air outlet one-way valve communicating with the cylinderroom 114 and an air outlet 124 formed on the base tray 110, whereby theair can only one-way flow from the cylinder room to the air outlet; and

[0044] an air inlet valve 125 disposed in the base tray andcommunicating with the depression 112 and outer side, in normal state,the air inlet valve 125 keeping in an airtight state.

[0045] The bottom end of the connecting block 105 is formed with a shafthole (not shown) for pivotally connecting the support tray 90 and theslide rail 100 with a pivot shaft 111 disposed at the center of top faceof the base tray 110. FIGS. 9 and 10 show a state after installed.

[0046] In use, as shown in FIG. 16, the grinder 70 is mounted on thebracket mechanism 80 and lifted. By means of linearly sliding thegrinder along the slide rail 100 and rotating the grinder on the basetray 110, the grinder can be two-dimension moved to grind inner hole inthe stone material.

[0047] When the base tray 110 is placed on the stone material, the gumring 113 isolates the depression 112 from outer side. An operator can upand down shift the lever 118 to drive the piston 116 to reciprocallymove within the cylinder room 115. When the piston is moved upward, theair is sucked from the depression through the air inlet one-way valve120 into the cylinder room. When the piston is moved downward, the airin the cylinder room is exhausted from the air outlet 124. Accordingly,by means of repeatedly operating the lever, the depression is vacuumed,whereby the base tray sucks and locates on the stone material withoutmoving.

[0048] When releasing the depression 112 from the vacuum, the pullbutton 126 of the air inlet valve 125 is pulled upward to release theair inlet valve from the airtight state. The atmosphere can flow throughan orifice 127, as shown in FIG. 15, into the depression to balance theair pressure in the depression with the atmosphere.

[0049] Furthermore, referring to FIG. 17, when the base seat 10 ismounted on the support tray 90, the valve 55 of the controlling switchis pushed and displaced upward by the abutting post 94. Under suchcircumstance, the two flow conducting sections 56, 57 are bothdisaligned from the passage 22 and the tunnel 24 to shut off the air wayB and water way C. Accordingly, both the high pressure air and the waterwill not be exhausted from the bottom face of the base seat.

[0050] When separating the base seat 10 from the support tray 90, thevalve 55 is pushed by the spring 58 to restore to its home position asshown in FIG. 3 to re-free the air way and water way.

[0051] The pneumatic grinder has smaller volume and lighter weight thanthe conventional electric grinder. Most importantly, the high pressureair and the water are conducted to the bottom face of the base seat soas to reduce the frictional force against the base seat when moved.Therefore, the operation can be performed with less strength. Moreover,in the case that the bracket mechanism is added to the pneumaticgrinder, the grinder can be two-dimension moved to grind inner hole ofthe stone material.

[0052] It should be noted that in the case that the bracket mechanism isomitted, it is unnecessary to dispose the controlling switch.

[0053] The above embodiments are only used to illustrate the presentinvention, not intended to limit the scope thereof. Many modificationsof the above embodiments can be made without departing from the spiritof the present invention.

What is claimed is:
 1. Base seat of pneumatic grinder, comprising: anair way disposed in the base seat, one end of the air way communicatingwith outer side of the base seat for high pressure air to flow into theair way; an air chamber disposed in the base seat; an inner end of theair way communicating with the air chamber; a predetermined number ofair rooms disposed in the base seat at intervals, a bottom end of eachthe air room communicating with the bottom face of the base seat, aninterior of the air room communicating with the air chamber; and ballbodies a number of which are equal to the number of the air rooms, theball bodies being respectively rollably disposed in the air rooms,bottom edge of the ball bodies protruding from the bottom face of thebase seat.
 2. Base seat of pneumatic grinder as claimed in claim 1,further comprising a controlling switch including a valve formed with aflow conducting section, the valve being disposed in the base seat andbeing connected with the air way, the valve being operable to movewithin the base seat to make the flow conducting section communicatewith the air way or make the flow conducting section not communicatewith the air way.
 3. Base seat of pneumatic grinder comprising: a waterway disposed in the base seat, one end of the water way communicatingwith outer side of the base seat for water to flow into the water way; awater chamber disposed in the base seat; an inner end of the water waycommunicating with the water chamber; and a predetermined number ofwater outlets disposed on bottom wall of the water chamber, the wateroutlets downward passing through the bottom wall to the bottom face ofthe base seat.
 4. Base seat of pneumatic grinder as claimed in claim 3,further comprising a controlling switch including a valve formed with aflow conducting section, the valve being disposed in the base seat andbeing connected with the water way, the valve being operable to movewithin the base seat to make the flow conducting section communicatewith the water way or make the flow conducting section not communicatewith the water way.
 5. Base seat of pneumatic grinder, comprising: anair way disposed in the base seat, one end of the air way communicatingwith outer side of the base seat; an air chamber disposed in the baseseat; an inner end of the air way communicating with the air chamber; apredetermined number of air rooms disposed in the base seat atintervals, a bottom end of each the air room communicating with thebottom face of the base seat, an interior of the air room communicatingwith the air chamber; ball bodies a number of which are equal to thenumber of the air rooms, the ball bodies being respectively rollablydisposed in the air rooms, bottom edge of the ball bodies protrudingfrom the bottom face of the base seat. a water way disposed in the baseseat, one end of the water way communicating with outer side of the baseseat; a water chamber disposed in the base seat, an inner end of thewater chamber communicating with the water way; and a predeterminednumber of water outlets disposed on bottom wall of the water chamber,the water outlets downward passing through the bottom wall to the bottomface of the base seat.
 6. Base seat of pneumatic grinder as claimed inclaim 5, wherein an inlet is formed on the circumference of the baseseat for the fluid to flow into the base seat, outer ends of the air wayand water way being concentrically disposed at the inlet.
 7. Base seatof pneumatic grinder as claimed in claim 6, wherein the base seat isrecessed to form a hole in the position of the inlet, an inner tubebeing coaxially disposed in the hole, an interior of the hole and aninterior of the inner tube respectively forming two independent flowways as outer end of the air way and outer end of the water way.
 8. Baseseat of pneumatic grinder as claimed in claim 5, further comprising acontrolling switch including a valve formed with two flow conductingsections, the valve being disposed in the base seat and being connectedwith the air way and water way, the valve being operable to move withinthe base seat to make the two flow conducting sections respectivelycommunicate with the air way and water way or make the flow conductingsections not communicate with the air way and water way.
 9. Base seat ofpneumatic grinder as claimed in claim 8, further comprising a cavityformed on the bottom face of the base seat, the air way and water wayboth passing through the cavity, the valve being disposed in the cavity.10. Base seat of pneumatic grinder as claimed in claim 9, wherein thebottom face of the base seat having a perforation at bottom end of thecavity; the controlling switch further including a resilient memberdisposed in the cavity for pushing the valve, whereby in normal state,the valve is kept at a lower dead end, the bottom end of the valve beingpositioned at the perforation, the two flow conducting sectionsrespectively communicating with the air way and water way.
 11. Base seatof pneumatic grinder as claimed in claim 10, wherein the controllingswitch further comprising a barrel, a circumference of the barrel beingformed with two through holes, the perforation being formed on bottomface of the barrel, the barrel being disposed in the cavity, the twothrough holes respectively communicating with the air way and water way,the valve being mounted in the barrel, the perforation being located onthe bottom face of the base seat; whereby when the valve is positionedat the lower dead end, the bottom end of the valve is located at thebottom end of the barrel.
 12. Base seat of pneumatic grinder as claimedin claim 5, wherein a spacer ring and a hollow locating member aredisposed in each air room, the locating member being positioned underthe spacer ring, the spacer ring being formed with several orificespassing through the spacer ring from top face to bottom face thereof,the ball body being positioned between the locating member and thespacer ring.
 13. Base seat of pneumatic grinder as claimed in claim 5,further comprising a bracket mechanism including: a support tray, thebase seat being connected with top face of the support tray; a sliderail, bottom face of the support tray being mounted on the slide rail,whereby the support tray is slidable along the slide rail; and a basetray, bottom face of the slide rail being pivotally connected with topface of the base tray via a pivot shaft, whereby the support tray andthe slide rail are rotatable on the base tray.
 14. Base seat ofpneumatic grinder as claimed in claim 10, further comprising a bracketmechanism including: a support tray, an abutting post being disposed ontop face of the support tray, the base seat being connected with topface of the support tray, the abutting post extending into theperforation for upward pushing the valve of the controlling switch toshut off the air way and water way; a slide rail, bottom face of thesupport tray being mounted on the slide rail, whereby the support trayis slidable along the slide rail; and a base tray, bottom face of theslide rail being pivotally connected with top face of the base tray viaa pivot shaft, whereby the support tray and the slide rail are rotatableon the base tray.
 15. Base seat of pneumatic grinder as claimed in claim14, wherein a predetermined number of insertion holes are formed on thebottom face of the base seat; insertion posts being disposed on the topface of the support tray, whereby the insertion posts are inserted inthe insertion holes.
 16. Base seat of pneumatic grinder as claimed inclaim 15, wherein at least one lateral side of the base seat is formedwith a dent communicating with the edge of at least one insertion hole,at least one slide block being locked in each the dent by a screwedmember, at least one insertion post of the support tray being formedwith a recessed section, whereby an inner side of the slide block can beengaged with the recessed section.
 17. Base seat of pneumatic grinder asclaimed in claim 14, wherein the bottom face of the support tray isformed with an insertion channel in which the slide rail is inserted.18. Base seat of pneumatic grinder as claimed in claim 14, wherein thebracket mechanism further includes a connecting block fixed on thebottom face of the slide rail, bottom face of the connecting block beingpivotally connected with the top face of the base tray via a pivotshaft.
 19. Base seat of pneumatic grinder as claimed in claim 14,wherein a depression is formed on bottom face of the base tray, anannular airtight member being disposed around the depression, an airoutlet being disposed in the base tray to communicate with outer side;further comprising: a cylinder room disposed on top face of the basetray; a piston movably disposed in the cylinder room, a piston rod ofthe piston upward protruding from the cylinder room; a lever, one end ofthe lever being pivotally connected with the base tray, a lever body ofthe lever being connected with the piston rod; an air inlet one-wayvalve and an air outlet one-way valve disposed in the base tray, the airinlet one-way valve communicating with the cylinder room and thedepression, whereby the air can only one-way flow from the depression tothe cylinder room; the air outlet one-way valve communicating with thecylinder room and the air outlet, whereby the air can only one-way flowfrom the cylinder room to the air outlet; and an air inlet valvedisposed in the base tray and communicating with the depression andouter side, permitting the atmosphere to flow from outer side into thedepression, in normal state, the air inlet valve keeping in an airtightstate.
 20. Base seat of pneumatic grinder as claimed in claim 1, furthercomprising a bracket mechanism including: a support tray, the base seatbeing connected with top face of the support tray; a slide rail, bottomface of the support tray being mounted on the slide rail, whereby thesupport tray is slidable along the slide rail; and a base tray, bottomface of the slide rail being pivotally connected with top face of thebase tray via a pivot shaft, whereby the support tray and the slide railare rotatable on the base tray.
 21. Base seat of pneumatic grinder asclaimed in claim 3, further comprising a bracket mechanism including: asupport tray, the base seat being connected with top face of the supporttray; a slide rail, bottom face of the support tray being mounted on theslide rail, whereby the support tray is slidable along the slide rail;and a base tray, bottom face of the slide rail being pivotally connectedwith top face of the base tray via a pivot shaft, whereby the supporttray and the slide rail are rotatable on the base tray.